http://en.wikipedia.org/wiki/Socialist_millionaire This is how you can see whether two people have the same number without giving away either number.

http://mysqlgame.com/ SQL queries the video game.

http://algebraicthunk.net/~dburrows/blog/entry/package-management-sudoku/ Solving Sudoku with the apt package manager.

http://www.bluem.net/en/mac/pashua/ Pashua is a simple way to create native MacOS X GUIs for various languages.

http://en.wikipedia.org/wiki/Tetris_effect Ever played a video game so much that you've started seeing it everywhere?

http://en.wikipedia.org/wiki/Fishcam The world of broadcasting fish tanks.

http://www.hulu.com/watch/27800/koyaanisqatsi The owners to the rights of the movie Koyaanisqatsi have allowed the move to be shown online. Be sure to watch this, it's a classic!

http://www.newsbeuter.org/index.html Newsbeuter is a command-line RSS feed reader.

http://www.postandcourier.com/news/2008/jun/08/anatomy_bank_failure_when_liquidators_comes_callin/ A very interesting article about how the FDIC shuts down banks that have collapsed.

http://www.canonical.org/~kragen/oilpencil/making.html A guide to producing a font from your handwriting using open source software.